Add to Cart button for out of stocl

Hey All,
So when first programming and loading my site our programmer changed the ‘out of stock’ button to say “In Store Only” – now we want to change it back to either “out of stock”.

You can see an example of that on our front page with our hermit crab kit – https://youpet-cha.com/

Anyone know how to change that back?
Thanks!!!

The page I need help with: [log in to see the link]